Furnace-arch construction.



COLINCAMEBELL, 0F RUTHERFORD, NEW JERSEY.

FURNACE-ARCH CONSTRUCTION.

Specification of Letters Patent. Patentgd Diary 10, 1910.

Application filed December 30, woe. Serial Ho. 535,652,

To all whom it may concern:

Be it known that I, COLIN CAMPBELL, citizen of the United States, residing atRutherford, county of Bergen, State of New Jersey, have invented certain new and useful Imn-ovements in Furnace-Arch Construction, of which the following is a specification.

My invention relates to improvements in arches and more particularly to arches used in furnace construction.

The objects of my invention are to simplify and strengthen the construction of arch plates andv the fire blocks used in connection therewith as now used for the fireboxes of steam boiler furnaces.

A further object of my invention is to provide for the easy removal of the fireblocks, as the same become burned out or cracked by the intense heat of the fire, without disturbing the remaining blocks or necessitating the removal of any portion of the furnace structure.

With these and other objects in view my invention consists in the novel construction and arrangement of parts as hereinafter described and as pointed out in the accompanying drawing, in which:

Figure l is a front elevation of a fire-box partly broken away. showing my improved arch with some of the fire-blocks mounted therein. Fig. 2 is a front elevation of my improved metallic arch. Fig. 3 is a transverse section of the same. Fig. 4 is a bottom plan view of Fig. 2. Fig. 5 is a side elevation of one of my improved fire-blocks. Fig. 6 is a rear view thereof. Fig. 7 is a cross section of the same. Fig. 8 is a top plan of Fig. 5.

In Fig. 1 of the drawing I have shown my improved metallic arch plate A mounted over the fire-box C of a furnace and having a number of my improved fire-blocks B set into the arch plate as hereinafter described. The metallic arch plate A is preferably made of cast iron, and 1s made in the shape of a segment of a cone and has, cast integral therewith, dove-tailed tongues a, cast a sufficient distance apart to al ow for the reception of two fire-blocks between each two tongues. The tongues are square at their upper ends where they oin the casting, as at a and they graduall spread out to a dovetail, as Wlll be readily seen in the accomdrawing. The purpose of this portion is to allow for any imperin the corners of the casting, as Wlll panyin square faction be hereinafter described with reference to the fire-blocks.

B are the fire-blocks, made of refractory material, to be used with this casting and they taper toward the rear end, the purpose of which will be hereinafter described. The blocks B are provided with a dove-tailed recess (Z on one side thereof, adapted to fit the tongue in the arch plate and having the other side recessed as at c the recess being formed between the ends of the block and not extending the whole length thereof. The dove-tailed recess runs almost. the whole length of one side of the block and has the part above said recess cut away, as at d, which corresponds to the square part a, of the tongues in the arch plate. This peculiar construction of the tongues and fire-blocks is to allow for any imperfection in the corners, where the tongues meet the arch plate, during the casting operation. Two of these blocks have corresponding recesses in their sides and are held together by a cement binder or other suitable binding material and are then slid into place between the tongues in the arch plate. The front ends of the blocks terminate in an upwa'rdy projecting lip or flange as shown at g for covering the arch plate when they are in position.

It is evident from the fore oing description that the metallic arch p ate A is first put into position above the fire-box of a furnaoe and the fire-blocks B then slid into position between the tongues. As before stated the arch plate is'cone shaped, or is the segment of a cone, and the fire-blocks being tapered, will, when forced into position, be wedged firmly and securely in place and the lip or flange 9 will cover the front of the 1ate,"and lie flush with the brickwork of the furnace. Should any of the blocks become burned out it is only necessary to remove them and insert a new pair in place, without disturbing the rest of the arch. If for any reason the blocks are too wide to fit between the tongues the part surrounding the recesses 6 'may be chipped off,

I tongues cast integral therewith, a pair of j fire-blocks held together by a binding agent and removably secured'in said arch-plate between saidv tongues.

I do not limit my invention to a spring or curved arch, but desire to employ it wherever it can be advantageously'used'.

Having thus described my invention What I claim and desire to secure by Letters Patent is: V v

1. In arch construction the, combination with an arch plate, .said arch plate being a segment of a cone, of holding means cast, integral therewith and tapered fire-blocksl removably held and secured by said holding means.

2. In arch construction the combination with an arch plate, said arch plate being a true segment with an arch tongues cast integral therewith, a pair of fire-blocks held together by a binding agent,

receive the aforementioned tongues and removably held and secured between said tongues". a 6. In arch construction, the combination of a cone, dove-tailed tongues cast integral with said arch plate and correspondingly grooved fire-blocks removably true segment of a cone, having recesses, said recesses adapted to 16C81V} a binding agent, and means for reheld and secured by said dove-tailed tongues. movably securing said fire-blocks in said v 3. In arch construction, the combination arch plate. V with an arch plate, said arch plate being a In testimony whereof I have hereunto set true segment of a cone, dovetailed tongues my hand in presence of two subscribing wit fciast gite ralhwith said arch plia teHtapering nesses. I reoc avln correspon 1n dove- M tailed recesses adaited to be rem v bly se- COLIN CAMPBELL cured in said arch plate. I Witnesses: i

4. In arch construction, the combination BERNICE GJTRAYNHAM, with an arch plate having dove-tailed JAooB Freer.

1 l 5. In arch construction, the combination plate having dove-tailed and having dove-tailed recesses,'adapted to a with an arch plate, said arch plate being a pair of fire-blocks 

